0.77 kg/L
The density of petrol ranges from 0.71–0.77 kg/L (719.7 kg/m3 ; 0.026 lb/in3; 6.073 lb/US gal; 7.29 lb/imp gal), higher densities having a greater volume of aromatics. Since petrol floats on water, water cannot generally be used to extinguish a petrol fire unless used in a fine mist.
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